JP5317726B2 - Fly ash transport system - Google Patents

Description

  The present invention relates to a fly ash transport system, and more particularly, to a fly ash transport system that transports fly ash generated by burning coal in a boiler by pneumatic transport.

  In general, the ash generated by burning coal in the boiler furnace of a thermal power plant is divided into bottom ash that falls downward from the boiler furnace and discharged, and fly ash that is discharged from the boiler furnace together with the airflow. Broadly divided.

  In this case, the bottom ash is collected directly from the ash hopper at the bottom of the furnace to a jet pack vehicle, etc., and fly ash is separated into fly ash (raw ash raw powder) and fly ash (collected raw powder), and fly ash (Ash raw powder) is led from the furnace to the ash raw powder silo via a transport pipe, stored as ash, is humidified by a humidifier, and then collected in a jet pack car, etc., and fly ash (collected raw powder) Is led from the furnace through the electric dust collector to the recovered raw powder silo and stored in ash.

  In addition, fly ash (collected raw powder) stored in the recovered raw powder silo is transported by pneumatic transport in a transport pipe by a pressure transporter and collected by a ship or the like, or fly ash (coarse powder) and fly ash The fly ash (coarse powder) is further separated into (fine powder) and is stored in ash by being guided to a coarse silo, and is collected by a jet pack car after being humidified by a humidifier. After being stored in ash by being guided to a fine powder silo, it is transported by pneumatic transport through the transport pipe and collected by a ship or the like.

  Of the ash collected through the above system, fly ash (collected raw powder (coarse powder and fine powder)) is effectively used as a cement raw material. If foreign matter such as debris from the air preheater element is mixed, it may cause failure of equipment that uses fly ash as a raw material for cement, etc., so foreign matter mixed in fly ash before collecting fly ash Must be removed in some way.

  Conventionally, in order to remove foreign matter contained in fly ash, a strainer has been installed in the middle of the transport pipe that transports fly ash from the furnace of the boiler to the ash scrap flour silo. The current situation is that it cannot be avoided.

Japanese Patent Publication No.3-333966

  The present invention has been made in view of the above-described conventional problems, and an object of the present invention is to provide a fly ash transport system capable of collecting fly ash in which foreign matters are not mixed.

In order to solve the above problems, the present invention employs the following means.
That is, the present invention collects fly ash discharged from the furnace of the boiler, temporarily stores it in a relay silo, guides it from the relay silo to a transport pipe by a pressure transporter, and transports the inside of the transport pipe by air to collect it. In the fly ash transportation system, the pressure transporter has an inlet connected to an outlet of the relay silo, an outlet connected to the transport pipe, and an internal fly ash supplied from the relay silo. A pressure feed tank for storing ash and an air supply source for supplying air to the transport pipe, and a feeder for supplying fly ash from the relay silo to the pressure feed tank is provided at an inlet of the pressure feed tank The feeder is divided into a first chamber connected to the outlet of the relay silo and a second chamber connected to the inlet of the pressure tank. And an on-off valve that opens and closes between the first chamber and the second chamber, and foreign matter mixed in the fly ash is connected to a connection portion of the second chamber with the inlet portion of the pressure tank. A strainer for capturing and removing is detachably provided .

According to the fly ash transportation system of the present invention, the fly ash once stored in the relay silo is supplied from the relay silo to the pressure feeding tank of the pressure transporter , led from the pressure feeding tank to the transportation pipe, and pneumatically transported in the transportation pipe. In the recovery, foreign matter mixed in the fly ash can be captured and removed by a strainer provided between the feeder at the inlet of the pressure tank and the inlet of the pressure tank . Therefore, since fly ash that does not contain foreign substances is guided from the relay silo to the pressure feed tank, can be guided from the pressure feed tank to the transport pipe, and can be recovered through the transport pipe, when using fly ash as a cement raw material, Equipment that uses fly ash as a raw material for cement or the like does not break down due to foreign matter mixed in the fly ash.
The feeder includes a casing that is partitioned into a first chamber that is connected to an outlet portion of the relay silo and a second chamber that is connected to an inlet portion of the pressure tank, and a first chamber and a second chamber. An open / close valve that opens and closes the space, and a strainer is detachably provided at the connection with the inlet of the pressure tank in the second chamber, so that foreign matter captured by the strainer is stored in the second chamber in the casing. Can do. Therefore, it is possible to prevent the trapped foreign matter from flowing back to the first chamber side or flowing into the pressure feed tank side.

  Furthermore, in this invention, the said strainer is good also as having the mesh-shaped sieve part of the magnitude | size which can capture | acquire the foreign material mixed in the said fly ash.

According to the fly ash transport system of the present invention, the foreign matter mixed in the fly ash can be captured and removed by the mesh-shaped sieve portion, and the fly ash not mixed with the foreign matter is pumped from the relay silo to the pressure tank. It can be led to the transport pipe from the pressure feed tank and recovered via the transport pipe.
Therefore, when fly ash is used as a cement raw material or the like, it is possible to avoid failure of equipment using fly ash as a cement raw material or the like due to foreign matters mixed in the fly ash.

As described above, according to the fly ash transportation system of the present invention, fly ash that is not contaminated with foreign matter can be collected, so when fly ash is used as a cement raw material or the like, it is mixed into fly ash. The equipment does not break down due to the foreign matter being used, and fly ash can be effectively used as a cement raw material or the like.
The feeder includes a casing that is partitioned into a first chamber that is connected to an outlet portion of the relay silo and a second chamber that is connected to an inlet portion of the pressure tank, and a first chamber and a second chamber. An opening / closing valve that opens and closes the space, and the strainer is detachably provided at the connection portion with the inlet portion of the pressure tank in the second chamber, so that foreign matter captured by the strainer can be stored in the second chamber of the feeder. As a result, the trapped foreign matter can be prevented from flowing back from the second chamber of the feeder to the first chamber side or flowing from the second chamber to the pressure tank side, and the fly ash free of foreign matter is reliably collected. be able to.

1 is a system diagram showing an entire embodiment of a fly ash transportation system according to the present invention. It is a front view of the pressure transporter of FIG. FIG. 3 is a side view of FIG. 2. It is explanatory drawing which showed the inside of the inlet feeder of FIG. It is a perspective view of a strainer.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 5 show an embodiment of a fly ash transportation system according to the present invention. 1 is a system diagram of a fly ash transport system, FIG. 2 is a front view of a pressure transporter, FIG. 3 is a side view of FIG. 2, FIG. 4 is an explanatory view showing the inside of an inlet feeder, and FIG. 5 is a perspective view of a strainer. It is.

  That is, the fly ash transportation system of the present embodiment is applied to a transportation system that transports fly ash 40 generated by burning coal in a boiler furnace of a thermal power plant by pneumatic transportation. This is effective for collecting the fly ash 40 that is not.

  Here, the foreign material 41 is, for example, a fragment of an element (steel plate for a heat exchanger) of an air preheater of a boiler. Thermal power plants are working to prevent the debris of air preheater elements from falling off when the boiler is stopped, etc., but the elements of the air preheater have completely fallen off due to deterioration over time. I can't stop. For this reason, it is inevitable that debris or the like of the element of the air preheater is mixed in the fly ash 40 as the foreign matter 41. Therefore, in the present embodiment, foreign matter 41 such as a fragment of an air preheater element mixed in fly ash 40 is captured and removed during transportation, and fly ash 40 not containing foreign matter 41 is recovered. It is configured.

  The fly ash transportation system of the present embodiment includes a first transportation system 1, a second transportation system 2, and a second transportation system 2 that transport fly ash 40 generated in a boiler furnace and collect it in a jet pack car 35, a ship 36, and the like. Three transport systems 3 are provided, and fly ash 40 is separated and collected into fly ash (ashed raw powder 40a) and fly ash (collected raw powder 40b).

  The first transportation system 1 captures fly ash 40 from a furnace of a boiler together with an air current by guiding it to an EP (electric dust collector 4), and this fly ash 40 is fly ash (ash dust raw powder 40a) and fly ash (collected raw powder). 40b), the fly ash (ash crushed powder 40a) is guided to the ash discarded powder silo 5 for ash storage, and the fly ash (collected raw powder 40b) is guided to the recovered raw powder silo 6 for ash storage. The fly ash (ash raw powder 40a) stored in the ash raw powder silo 5 is humidified by the humidifier 8 and then collected by the jet pack car 35.

  In this case, a known strainer (not shown) is provided in the payout portion to the jet pack car 35, and the foreign matter 41 mixed in the fly ash (ash dust raw powder 40a) is captured and removed by this strainer. The lyash (ash raw powder 40a) in which the foreign matter 41 is not mixed is collected by the jet pack car 35.

  In addition, fly ash (ash trash powder 40a) is guided from the MC, AH, and ECO to the ash discarded powder silo 5, and the fly ash (ash trash powder 40a) is also stored in the jet pack car 35. It is collected by.

  The second transport system 2 transports a part of fly ash (collected raw powder 40b) stored in the recovered raw powder silo 6 of the first transport system 1 from the recovered raw powder silo 6 via the pressure transporter 10. Then, the air is transported in the transport pipe 34 by air and collected by a jet pack car 35 or a ship 36 disposed at the end of the transport pipe 34.

  The third transport system 3 uses fly ash (coarse powder 40c) and fly ash (fine powder 40d) for the rest of fly ash (collected raw powder 40b) stored in the recovered raw powder silo 6 of the first transport system 1. Further, the fly ash (coarse powder 40c) is guided to the coarse powder silo 31 and stored in the ash, and is humidified by the humidifier 32 and then collected by the jet pack car 35, etc., and the fly ash (fine powder 40d) is collected into the fine powder silo. After being guided to 33 and stored as ash, it is guided to the transport pipe 34, transported pneumatically through the transport pipe 34, and collected by a jet pack car 35, a ship 36, etc. disposed at the end of the transport pipe 34.

  As shown in FIGS. 2 and 3, the pressure transport machine 10 includes a pressure feed tank 11 that stores fly ash (collected raw powder 40 b) supplied from the recovered raw powder silo 6 and an inlet portion of the pressure feed tank 11. 12, an inlet feeder 14 provided at the outlet 12, an outlet feeder 21 provided at the outlet 13 of the pressure feed tank 11, a strainer 28 detachably provided between the inlet feeder 14 and the inlet 12 of the pressure feed tank 11, and a transport pipe. 34 is provided with an air supply source 27 for supplying air.

  In the pressure feed tank 11, the inlet 12 is connected to the outlet 7 of the recovered raw material silo 6 via the inlet feeder 14, and the outlet 13 is connected to the transport pipe 34 via the outlet feeder 21. The fly ash (collected raw powder 40b) stored in the recovered raw powder silo 6 is supplied from the recovered raw powder silo 6 into the pressure feed tank 11 through the inlet feeder 14 and the strainer 26, and is then discharged from the pressure feed tank 11 to the outlet. It is supplied into the transport pipe 34 via the feeder 21.

  The inlet feeder 14 includes a casing 15 whose interior is divided into a first chamber 16 and a second chamber 17, an on-off valve 19 that opens and closes between the first chamber 16 and the second chamber 17 of the casing 15, and an on-off valve And an actuator 20 for driving the motor 19. In the inlet feeder 14, the first chamber 16 of the casing 15 is connected to the outlet portion 7 of the recovered raw powder silo 6, the second chamber 17 is connected to the inlet portion 12 of the pressure feed tank 11, and the second chamber 17 of the casing 15 A strainer 28 is detachably provided at a connection portion with the inlet portion 12 of the pressure tank 11.

  The open / close valve 19 is driven by the actuator 20 to open the space between the first chamber 16 and the second chamber 17 of the casing 15, so that fly ash (recovered raw powder 40 b) in the recovered raw powder silo 6 is removed from the casing 15. It is supplied into the pressure tank 11 through the first chamber 16 and the second chamber 17. Further, the opening / closing valve 19 is driven by the actuator 20 to close the space between the first chamber 16 and the second chamber 17 of the casing 15, thereby the first chamber 16 and the second chamber of the casing 1 from the recovered raw powder silo 6. The supply of fly ash (recovered raw powder 40b) into the pressure feed tank 11 through 17 is stopped.

  The outlet feeder 21 includes a casing 22 whose interior is divided into a first chamber 23 and a second chamber 24, an on-off valve 25 that opens and closes between the first chamber 23 and the second chamber 24 of the casing 22, and an on-off valve And an actuator 26 for driving 25. In the outlet feeder 21, the first chamber 23 of the casing 22 is connected to the outlet portion 13 of the pumping tank 11, and the second chamber 24 is connected to the transport pipe 34.

  The on / off valve 25 is driven by the actuator 26 to open the space between the first chamber 23 and the second chamber 24 of the casing 22, so that the fly ash (recovered raw powder 40 b) in the pressure feed tank 11 is the first of the casing 22. It is supplied into the transport pipe 34 via the chamber 23 and the second chamber 24. Further, the opening / closing valve 25 is driven by the actuator 26 to close the space between the first chamber 23 and the second chamber 24 of the casing 22, thereby connecting the first chamber 23 and the second chamber 24 of the casing 22 from the pressure feed tank 11. The supply of fly ash (collected raw powder 40b) into the transport pipe 34 is stopped.

  For example, as shown in FIG. 5, the strainer 28 includes a rectangular plate-shaped support portion 29 and a mesh-like sieve portion 30 provided at the center of the support portion 29, and the strainer 28 has a first shape of the casing 15 of the inlet feeder 14. The sieving portion 30 is detachably provided in the second chamber 17 of the casing 15 so that the sieving portion 30 is disposed at a connection portion between the two chambers 17 and the inlet portion 12 of the pressure feeding tank 11. The foreign matter 41 mixed in the fly ash (collected raw powder 40b) is captured by the sieve portion 30 of the strainer 28.

  The screen portion 30 of the strainer 28 is formed in a mesh shape having a size capable of catching the foreign matter 41 (debris etc. of the air preheater element) mixed in the fly ash (collected raw powder 40b). By capturing the foreign matter 41 mixed in the fly ash (collected raw powder 40 b), the fly ash (collected raw powder 40 b) in which the foreign matter 41 is not mixed is supplied into the pressure feed tank 11 through the inlet feeder 14. Is done.

  The foreign matter 41 captured by the sieve portion 30 of the strainer 28 is stored in the second chamber 17 of the casing 15 and periodically removed by removing the lid 18 that closes the opening of the second chamber 17 of the casing 15. The foreign matter 41 can be taken out from the second chamber 17 and recovered and discarded.

  In the fly ash transportation system according to the present embodiment configured as described above, fly ash (collected raw powder 40b) once stored in the recovered raw powder silo 6 is transferred from the recovered raw powder silo 6 to the pressure feed tank 11. , The foreign matter 41 mixed in the fly ash (collected raw powder 40b) is captured by passing through a strainer 28 provided between the inlet 12 and the inlet feeder 14 of the pressure feed tank 11, and the foreign matter 41 is captured. Fly ash (recovered raw powder 40b) that is not mixed can be guided to the pressure-feed tank 11.

  Accordingly, the fly ash (collected raw powder 40b) in which the foreign matter 41 is not mixed is guided from the pressure feed tank 11 to the transport pipe 34 through the outlet feeder 21, and is transported by air in the transport pipe 34 to be used in the jet pack car 35 or the ship. It can be recovered to 36 etc.

  As a result, when fly ash (recovered raw powder 40b) is used as a cement raw material or the like, fly ash (recovered raw powder 40b) is used as a cement raw material or the like due to foreign matter 41 mixed in fly ash (recovered raw powder 40b). The equipment used does not break down, and fly ash (collected raw powder 40b) can be used effectively as a cement raw material or the like.

  In the present embodiment, the foot trainer 28 is provided between the inlet feeder 14 and the inlet portion 12 of the pressure feeding tank 11, but not shown, but between the outlet portion 13 of the pressure feeding tank 11 and the outlet feeder 21. The strainer 28 may be provided at the inlet, and the strainer 28 may be provided both between the inlet feeder 14 and the inlet portion 12 of the pressure feed tank 11 and between the outlet portion 13 of the pressure feed tank 11 and the outlet feeder 21. . In short, it is only necessary that the foreign matter 41 mixed in the fly ash (collected raw powder 40b) can be captured and removed before the supply to the transport pipe 34.

DESCRIPTION OF SYMBOLS 1 1st transport system 2 2nd transport system 3 3rd transport system 4 Electric dust collector 5 Ash dust raw powder silo 6 Collected raw powder silo 7 Outlet part 8 Humidifier 10 Pressure transporter 11 Pressure feed tank 12 Inlet part 13 Outlet part 14 Inlet Feeder 15 Casing 16 First chamber 17 Second chamber 18 Lid 19 Open / close valve 20 Actuator 21 Outlet feeder 22 Casing 23 First chamber 24 Second chamber 25 Open / close valve 26 Actuator 27 Air supply source 28 Strainer 29 Support section 30 Sieve section 31 Coarse Powder silo 32 Humidifier 33 Fine powder silo 34 Transport pipe 35 Jet pack car 36 Ship 40 Fly ash 40a Fly ash
40b Fly ash (collected raw powder)
40c fly ash (coarse powder)
40d fly ash (fine powder)
41 Foreign matter

Claims (2)

In a fly ash transportation system in which fly ash discharged from a furnace of a boiler is collected and temporarily stored in a relay silo, guided from the relay silo to a transport pipe by a pressure transporter, and then transported by air to recover the inside of the transport pipe ,
The pressure transport machine has an inlet part connected to an outlet part of the relay silo, an outlet part connected to the transport pipe, and a pressure feed tank for storing ashes of fly ash supplied from the relay silo inside, An air supply source for supplying air to the transport pipe,
A feeder for supplying fly ash from the relay silo to the pumping tank is provided at the inlet of the pumping tank,
The feeder includes a casing that is partitioned into a first chamber connected to an outlet of the relay silo and a second chamber connected to an inlet of the pressure tank, the first chamber, and the second chamber. An open / close valve that opens and closes the chamber,
A fly ash transport system characterized in that a strainer that captures and removes foreign matters mixed in the fly ash is detachably provided at a connection portion of the second chamber with the inlet portion of the pressure tank .   2. The fly ash transport system according to claim 1, wherein the strainer includes a mesh-like sieve portion having a size capable of capturing foreign matters mixed in the fly ash. 3.

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